A column footing 1.6 × 1.6m is required to be founded in a moderately strong rock mass of limestone. An embedmentdepth of 1.5 m is required to get through the top soil and weathered rock zone. Tests on rock cores takenbelow the foundation level showed representative unconfined compression strength quc = 24 MPa; other tests gaveaverage RQD= 0 5; friction angle Ø = 38 and rock unit weight γ =24 5 kN m3. Neglect the relatively thin topsoil layer which overlies the rock. For the footing concrete use fc = 28 MPa. Assume a safety factor against bearingcapacity failure = 4. Estimate the gross safe bearing capacity for the foundation, taking into consideration the effectof discontinuities of the rock.
A column footing 1.6 × 1.6m is required to be founded in a moderately strong rock mass of limestone. An embedmentdepth of 1.5 m is required to get through the top soil and weathered rock zone. Tests on rock cores takenbelow the foundation level showed representative unconfined compression strength quc = 24 MPa; other tests gaveaverage RQD= 0 5; friction angle Ø = 38 and rock unit weight γ =24 5 kN m3. Neglect the relatively thin topsoil layer which overlies the rock. For the footing concrete use fc = 28 MPa. Assume a safety factor against bearingcapacity failure = 4. Estimate the gross safe bearing capacity for the foundation, taking into consideration the effectof discontinuities of the rock.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A column footing 1.6 × 1.6m is required to be founded in a moderately strong rock mass of limestone. An embedment
depth of 1.5 m is required to get through the top soil and weathered rock zone. Tests on rock cores taken
below the foundation level showed representative unconfined compression strength quc = 24 MPa; other tests gave
average RQD= 0 5; friction angle Ø = 38 and rock unit weight γ =24 5 kN m3. Neglect the relatively thin top
soil layer which overlies the rock. For the footing concrete use fc = 28 MPa. Assume a safety factor against bearing
capacity failure = 4. Estimate the gross safe bearing capacity for the foundation, taking into consideration the effect
of discontinuities of the rock.
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